What is the fault with my toshiba video cassette recorder? DVR19DTKB?

I have had a toshiba video cassette recorder dvr19dtkb for a few years and have had no problems with it. I recently purchased a new samsung TV and now find that I am unable to record from my sky box on to a DVD. My previous TV was also a samsung so I am certain all the connections are correct. I am able to record from a video tape on the machine to a DVD but not able to record from my sky box to a DVD. I have checked and replaced the scart leads but without success. Help!!